diff --git a/harbour/source/vm/extend.c b/harbour/source/vm/extend.c
index cdbd3026bc..3b21fee3d2 100644
--- a/harbour/source/vm/extend.c
+++ b/harbour/source/vm/extend.c
@@ -68,6 +68,10 @@
  *
  */
 
+#ifdef HB_API_MACROS
+   #undef HB_API_MACROS
+#endif
+
 #include "hbapi.h"
 #include "hbapiitm.h"
 #include "hbset.h"